net.peeweek.gameplay-ingredients/Editor/AssetFactory/AssetFactory.cs

using UnityEngine;
using UnityEditor.Callbacks;
using UnityEditor.ProjectWindowCallback;
using System;
using System.IO;
using UnityEditor;

namespace GameplayIngredients.Editor
{
    public class AssetFactory
    {
        public static void CreateAssetInProjectWindow<T>(string iconName, string fileName) where T: ScriptableObject
        {
            var icon = EditorGUIUtility.FindTexture(iconName);

            var namingInstance = new DoCreateGenericAsset();
            namingInstance.type = typeof(T);
            ProjectWindowUtil.StartNameEditingIfProjectWindowExists(0, namingInstance, fileName, icon, null);
        }

        public static ScriptableObject CreateAssetAtPath(string path, Type type)
        {
            Debug.Log("CreateAssetAtPath (" + type.Name + ")");

            ScriptableObject asset = ScriptableObject.CreateInstance(type);
            asset.name = Path.GetFileName(path);
            AssetDatabase.CreateAsset(asset, path);
            return asset;
        }

        class DoCreateGenericAsset : EndNameEditAction
        {
            public Type type;

            public override void Action(int instanceId, string pathName, string resourceFile)
            {
                ScriptableObject asset = AssetFactory.CreateAssetAtPath(pathName, type);
                ProjectWindowUtil.ShowCreatedAsset(asset);
            }
        }

    }
}